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xen-devel
Re: [Xen-devel] [PATCH 07 of 10] Add new shutdown mode for checkpoint
On Thursday, 28 December 2006 at 16:51, Keir Fraser wrote:
> On 15/12/06 6:38 am, "Brendan Cully" <brendan@xxxxxxxxx> wrote:
>
> > Add new shutdown mode for checkpoint.
> >
> > When control/shutdown = checkpoint, invoke an alternate suspend path
> > that doesn't disconnect from back ends, and only reconnects when the
> > image has been restored into a new domain.
>
> I don't think a new type of 'checkpoint' handler is required in the guest
> OS. We are already most of the way there in terms of doing as little as
> possible on the suspend side of save/restore, so we should fix up what
> little else there is to be done. Looking at the differences versus your new
> checkpointing suspend:
> 1. Xenbus_suspend() needs to stay. Actually most drivers do not have a
> suspend handler anyway (only tpmfront does). We should provide a
> suspend_cancelled() hook callback so that drivers which *do* have a suspend
> handler can distinguish between proper resume and checkpoint return.
I guess this is what you had in mind? I don't have anything that uses
it at the moment though. It's just suspend_dev cut'n'pasted.
unsuspend.diff
Description: Text document
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